BioMedical Admissions Test (BMAT) Practice Test 2025 - Free BMAT Practice Questions and Study Guide

Question: 1 / 400

What is the color of Mg(OH)2 precipitate formed when Mg2+ ions are added to a NaOH solution?

Colorless

Brown

White

When magnesium hydroxide, Mg(OH)2, is formed as a precipitate by adding magnesium ions (Mg2+) to a sodium hydroxide (NaOH) solution, the resulting precipitate is characterized by its color, which is white. This compound is known to be insoluble in water, leading to the formation of a distinct white precipitate when the ions react in the solution.

In the context of this question, the formation of a white precipitate indicates that the Mg(OH)2 is effectively separating from the solution, which is a key aspect of its chemical behavior. Other potential colors such as colorless, brown, or yellow are not representative of magnesium hydroxide and do not apply to this reaction, reinforcing that the distinct white color of the precipitate is the correct and expected result.

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